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Life sciences · Journal article
Veterinary Sciences · August 4, 2026
Raises a question worth testing. It does not answer one.
This perspective synthesis examines evidence that migratory birds carry multidrug-resistant bacteria and resistance genes across ecological boundaries. The authors acknowledge that published evidence is predominantly observational and does not reconstruct complete transmission chains from source through birds to recipients, positioning birds primarily as mobile sentinels and opportunistic carriers rather than proven drivers of AMR dissemination.
Journal article. Migratory bird species across multiple taxa, sampled in published observational studies; includes exposure sources in wetlands, farms, wastewater-affected habitats, landfills, and coastal ecosystems.
Migratory birds carry multidrug-resistant Escherichia coli, Klebsiella pneumoniae, Salmonella spp., Enterococcus spp., and Campylobacter spp. with determinants including blaCTX-M, blaTEM, blaNDM, mcr, tet, sul, and qnr genes Eight evidence groups summarized are predominantly observational surveys or screenings None of the published studies reconstructs a complete source–bird–destination–recipient transmission chain
Safety was not reported in the material analysed. Check the source before drawing any conclusion about harm.
This perspective does not yet provide sufficient evidence to guide clinical or public health practice for AMR control through bird-directed interventions. It identifies critical gaps—the absence of proven transmission chains—that future research must address before bird populations can be targeted as a primary mitigation strategy.
This is a perspective synthesis acknowledging that published evidence is predominantly observational surveys with no complete transmission chain reconstructed, raising questions about migratory bird role in AMR dissemination rather than answering them definitively.
This perspective does not yet provide sufficient evidence to guide clinical or public health practice for AMR control through bird-directed interventions. It identifies critical gaps—the absence of proven transmission chains—that future research must address before bird populations can be targeted as a primary mitigation strategy.
Graded across the dimensions that decide whether you should act, each from what the source actually supports. There is no single score, and where a dimension was not assessed it says so.
What is missing. This record has no reported figures. That is a gap in the analysis, not a judgement about the study.
Antimicrobial resistance (AMR) is a major One Health challenge driven by antimicrobial misuse in human medicine, veterinary practice, animal production, and polluted environments. Migratory birds move among wetlands, farms, wastewater-affected habitats, landfills, and coastal ecosystems and may acquire and redistribute antimicrobial-resistant bacteria (ARB) and antimicrobial resistance genes (ARGs) across ecological and political boundaries. This perspective synthesizes evidence on exposure sources, bacterial reservoirs, resistance determinants, cross-species interfaces, and surveillance priorities while explicitly distinguishing four claims: detection or carriage, persistence in individual birds, redistribution along migratory routes, and onward transmission to recipient hosts or environments. Published studies report multidrug-resistant Escherichia coli, Klebsiella pneumoniae, Salmonella spp., Enterococcus spp., and Campylobacter spp., with determinants including blaCTX-M, blaTEM, blaNDM, mcr, tet, sul, and qnr genes. The eight evidence groups summarized here constitute an illustrative, non-comprehensive selection; they are predominantly observational surveys or screenings, and none reconstructs a complete source–bird–destination–recipient transmission chain. Taxon-specific ecology modifies exposure: gulls and storks frequently exploit refuse and wastewater, waterfowl and shorebirds connect aquatic habitats, whereas passerines often reflect more local point-source contamination. Current evidence therefore supports migratory birds primarily as mobile sentinels and opportunistic carriers of anthropogenic AMR, while acknowledging possible natural or ancestral resistance in avian-associated microbiota. Future surveillance should combine longitudinal sampling, baseline cohorts such as pre-migratory nestlings, paired bird–water–soil–sediment sampling, whole-genome sequencing, plasmid profiling, telemetry, environmental DNA, wastewater-based epidemiology, and interoperable veterinary reporting. Practical mitigation requires antimicrobial stewardship, wastewater and landfill control, farm biosecurity, and coordinated veterinary, environmental, and public-health action.
Taken from the source record, never inferred. Follow any of these and new work involving them reaches your briefing.